Vulnerability · Published Jan 12, 2026 · Assigned by GitHub_M
CVE-2026-22776cpp-httplib vulnerable to a denial of service (DOS) using a zip bomb
High 8.7
In plain English
A high-severity security flaw in cpp-httplib from yhirose. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.30.1, a Denial of Service (DoS) vulnerability exists in cpp-httplib due to the unsafe handling of compressed HTTP request bodies (Content-Encoding: gzip, br, etc.). The library validates the payload_max_length against the compressed data size received from the network, but does not limit the size of the decompressed data stored in memory.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | cpp-httplib | no fix listed | DEBIAN-CVE-2026-22776 |
| Debian:13 | cpp-httplib | no fix listed | DEBIAN-CVE-2026-22776 |
| Debian:14 | cpp-httplib | 0.41.0+ds-3 | DEBIAN-CVE-2026-22776 |
| Ubuntu:25.10 | cpp-httplib | no fix listed | UBUNTU-CVE-2026-22776 |
| Ubuntu:26.10 | cpp-httplib | no fix listed | UBUNTU-CVE-2026-22776 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| yhirose | cpp-httplib | < 0.30.1 |
Weakness: CWE-409 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N